[Equest-users] Auto-size HVAC from Detailed Mode

[Weekly, Ashley]

Ok, I am going to show how uneducated I am with eQuest…I was able to reduce my unmet hours on my baseline case by autosizing the equipment.  Now, I’m having problems with my proposed case.  I finally looked at the PS-A report and it’s showing that my heating and cooling are not coming on at all.  I don’t even know where to start changing controls in detailed mode.  My systems are 5 split system single zone heat pumps.  The hours are only showing up in one room per system (and these rooms have no significant loads).  I’ve tried changing the control space and it does nothing.  Also, this is the error showing up every time I run the simulation:

 

             ZONE EL1 Core Zn (G.C16)             

             might have insufficient heating capability.

             Check that the SYSTEM or ZONE HEATING-CAPACITY plus this

             ZONEs BASEBOARD-RATING is adequate to maintain the ZONE

             specified DESIGN-HEAT-T for the calculated peak ZONE load

             (see LS-A or LS-B for the ZONE peak load.)

 

I’ve included my  .inp file if anyone has the time to take a look.

Any help is appreciated!  Thanks!

 

 

 

 

 

 

From: John Aulbach [mailto:jra_sac at yahoo.com] 
Sent: Wednesday, September 29, 2010 4:16 PM
To: Weekly, Ashley; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Auto-size HVAC from Detailed Mode

 

Hi Ashley:

 

Don't know what is "legal" in LEED, but try reducing your semsible loads fraction for the kitchen and laundry down (say to 0.1). Perhaps assuming much heat goes out the exhausts for these items.

 

Also, increase your HVAC airflows.

 

Worth a try.

 

John R. Aulbach, PE, CEM

Senior Energy Engineer

________________________________

Partner Energy

1990 E. Grand Avenue, El Segundo, CA 90245
W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745

www.ptrenergy.com <http://www.ptrenergy.com/>  | jaulbach at ptrenergy.com <mailto:%7C%20jaulbach at ptrenergy.com> 

 

 

 

________________________________

From: "Weekly, Ashley" <aweekly at pryor-morrow.com>
To: equest-users at lists.onebuilding.org
Sent: Wed, September 29, 2010 1:48:38 PM
Subject: [Equest-users] Auto-size HVAC from Detailed Mode

Hello everyone.  I’m working on a baseline 2-story residential model using PTAC’s for LEED.  I’m having problems complying with the unmet hours in several locations.  I have commercial cooking equipment and laundry machines as my only large loads.  I have entered my calculated heating and cooling capacities and my calculated CFM for each space into detailed mode.  To help with my unmet hours, I bumped my sizing ratio up to 1.25 and set my throttling range at 6.  Still high unmet hours.  I was wondering if there is a way to switch heating and cooling capacities back to auto-size from detailed mode or do I just have to bump my capacities up until they cover my hours?

 

 



 

 


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